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Wroclaw, Poland. Published in Algebra i Logika, Vol. 13, No. 2, pp. 227–231, March–April, 1974.
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Jakubowicz, C.A. On generalized products preserving compactness. Algebra and Logic 13, 131–133 (1974). https://doi.org/10.1007/BF01463153
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DOI: https://doi.org/10.1007/BF01463153